Premium
Time‐Temperature‐Transformation Curves for Kaolinite‐α‐Alumina
Author(s) -
Liu KuoChung,
Thomas Gareth,
Caballero Angel,
Moya Jose S.,
Aza Salvador
Publication year - 1994
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1994.tb09755.x
Subject(s) - kaolinite , mullite , cristobalite , eutectic system , aluminium silicate , materials science , mineralogy , chemical engineering , chemistry , metallurgy , quartz , microstructure , ceramic , engineering
The C‐shaped time‐temperature‐transformation curves (T‐T‐T curves) of cristobalite formation and the L‐shaped T‐T‐T curves of α‐alumina reaction were established for a high‐purity kaolinite‐α‐alumina mixture during heating. The results revealed that cristobalite formation in kaolinite was retarded by the presence of α‐alumina between 1250° and 1350°C and was totally prohibited above 1380°C due to the reaction of kaolinite with α‐alumina to form secondary mullite. The reaction of α‐alumina with kaolinite was initiated at about 1250°C. It became quite extensive above 1380°C and was extremely fast at 1600°C and above, indicating the strong effect of the eutectic liquid formation at ∼1587°C in silica‐alumina. The effectiveness of the established T‐T‐T curves was demonstrated and discussed.